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JOURNAL OF PLANKTON RESEARCH | VOLUME 8 | NUMBER 5 | PAGES 957-972 | 1986
© Oxford University Press

research-article

Formulation of an ingestion function for a population of Paracalanus feeding on mixtures of phytoplankton

Julie W. Ambler

Department of Oceanography, Texas A&M University College Station, TX 77843, USA

Received on August 1, 1985; accepted on April 1, 1986 The effective food concentration concept is extended to modelling the ingestion of a Paracalanus population based on feeding experiments by Paffenhöfer, who simulated phytoplankton size distributions and concentrations of Gulf Stream intrusions in the South Atlantic Bight shelf. The effective food concentration concept uses selectivity coefficients, calculated for each phytoplankton size class and copepod developmental stage, to weight food concentration in Ivlev relations between ingestion and food concentration. These selectivity coefficients for each phytoplankton size class are formulated as functions of copepod weight and phytoplankton concentration. Parameters of the Ivlev curves are also made functions of copepod weight. The resulting ingestion equation is discussed within the context of copepod feeding, and applied to phytoplankton size distributions and concentrations typical of Gulf Stream intrusions.


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